I have a macbook unibody (2008). I replaced the hard drive earlier this year with a Seagate MOMENTUS XT, 500GB, 7200RPM - it's a hybrid. Going great.

Now, I just bought a macbook pro and wanted to replace the hard drive it came with with my Seagate. However, when I turn it on I get the 'no drive' sign. The drive it came with works great and (here is where it gets weird) when I hold down 'option' the seagate shows up as a drive - in other words it is connected.

I can't figure this one out. At first I thought it was the cable, but the fact that the drive is recognized but wont load says to me that the cable is working fine.

A no drive sign would be a flashing folder with question mark. Is that what you're getting. The ghostbusters symbol, prohibitory sign, means no valid operating system. Boot from the system install DVD on the MBP and repair permissions and verify the drive is good.

Ok, so it turns out that because Lion was created on a different model of Mac it isn't compatible with the new macbook pro.

So I can reload the new Lion onto the Seagate drive but that wipes it clean. I could use Migration Assistant to move everything over but then I loose all the licenses to my software (adobe/digidesign etc). I am really trying to avoid that!

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